Secure Web Space Costs

I'm working for an organisation which is looking for a company who can provide us with a public website to be updated with a CMS and 132 secure areas which should be accessible from that public website.

Today I was sent a proposal by them stating that there would be a cost per year of:

£3,350 for data storage areas of up to 20mb space per secure area (i.e. £25 per secure area)

£6,700 for data storage areas of up to 75mb space per secure area (i.e. £50.70 per secure area)

We really would prefer much more space per area than this (upwards of 2GB per area) and are a bit wary of how much is being charged for the storage space.

I have three questions on this :

1) How do these prices compare with other hosts that you know of? Are they reasonable?

2) Is this 'secure space' much more expensive than normal space?

3) Are there hosts that offer unlimited secure space for reasonable prices?

Btw, these are the facilities that this host provides:

6 redundant Internet connections
24x7x365 onsite support
Fire protection
Backup power generators
Daily back up to magnetic tape media
Anti virus protection for all uploaded content
Industry Standard Cisco firewalls